程序代码：

#include <stdio.h>
//定义求n!函数fun
int fun( int n)
{
    int i,s;
    for(i=1,s=1;i<=n;i++)
         s*=i;
    return s;
}
main()
{
    int i,j,a;
    double sum1,sum2;
    scanf("%d",&a);
    
    for(i=1,sum1=0;i<=a;i=i+2)
      sum1+=fun(i);
      
    for(j=1,sum2=0;j<=a;j++)
      sum2+=fun(j);
      
    printf("1!+3!+…+（2n+1)!=%f\n1!+2!+3+…+n!=%f\n",sum1,sum2);
}

程序代码：

#include <stdio.h>

double factorial(int n)
{ return n*((n==1)?1:factorial(n-1));}


double f(int n)
{return factorial(2*n+1)+((n==0)?0:f(n-1));}

double f1(int n)
{return factorial(n)+((n==1)?0:f1(n-1));}

int main(void)
{int n;
scanf ("%d",&n);
printf ("1!+2!+....+2*(n+1)的阶乘和为:%.0f\n1!+2!+.....+n!的阶乘和为%.0f",f(n),f1(n));
return 0;
}